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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '019d8d45f8a6e6c217a40d4d423a46f23d35d959e5ef08b7c6e769af1f659e65' 
  AND token = 'BZb5ZTJA84R7+9GMHDSn6PGj1bHnAj6fC2s/0bZ5uEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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