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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60d2d46d39c4997dd4234411ed0facddf42aa6b3b6eeb3192a7b5b1b7f1a2497' 
  AND token = 'ry1Ovs2HoJ0lXU31+v9cTfGff4kiQLMtPkR1bk8UfFQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}