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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '298b94681d0e4aced59f526dc6b391e528175c1958dc8207e6a21525e22dc5ba' 
  AND token = 'RYWtmVa1wq8U/aPWETWN6aL1Ik8meGEye8MagkbqI8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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