SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '89601286dbd31199907eda5e7453a3516bf3cf4bcb0aa19f3135af36c2d0e04b' 
  AND token = 'BqsJJ8lrqw9Qk1FXEVq3Bx0mkh5ZWf0850AMZhyGWVg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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