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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '66a68db686f3bc7543c48c54d046bf61b88ac042413d66111e68d44622ad9f70' 
  AND token = 'F6OXT5Xacu7VptylJfSkmDWdltR3pfDJIYh4xBnpIfQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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