SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5434283c2c10e2f2d0bcb396361cdc95113a44fac5d045f2b0299c60d8f7a1f0' 
  AND token = '0WJ4GvY/2/MYO1bfgPHroxeiOc/bqzhhSR6BAEjZyCk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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