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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe7ab93affd351c7d9cdd6b3d288fe05ec655151da814d0832a5d296f197e69c' 
  AND token = 'ngfREdYdSEr9T7wXW9bQCeixbkP9lOu9qd1RzIm8zxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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