SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02cfefe5b385cfeea10be948990dfaa4e6968f1dadb3b21133ded636502c0d2b' 
  AND token = 'B7aZUpnseUYDEH98qJnNsgQnTLIpVQpIpwXGgs+b0vU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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