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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '696fa043599815d4bf94d903cb89e7d9ec7a4cc17a8b979b4d2cb885b3f5efdd' 
  AND token = 'cGgxiGc75PQKOXcG0CxNr3UnGPln9utkzTDWp7UqYmM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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