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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c62fab8ad7c4e98e1deb320e0c896e46088b143f07ffab0da061628b9376572a' 
  AND token = 'jS3Udpkjptni8txAdc7FFu7dN++wKNH0vxV5aFlcz9k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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