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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '72f08a267b88ac4f5eb6336a8b57babf08b21a9b619487e166f83ecaa7364c32' 
  AND token = '+6cdcxmEAR2w8e7zh+7m2JmqvVDmXX5k4nhFTy/w8HU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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