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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35934f6796b5a8b11e5b0b92c8539f396508e1d064244462734d44a0acd43a30' 
  AND token = 'n4cqe+RjXFf7iYmSWfuvD9vmS3Vd8dpp5H41JydoL8g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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