SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c3882bbec2f70ef20c9db2349d43c41c0bc08dd49180c53987169a4fe534d179' 
  AND token = 'yjJxq/NkR2eGNRRvmKTXyy0JDU/BkhF4SHHNOQNBb5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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