SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ce9e78b857afe5e574b9a94a04754001ff8cec6e622c6ce0b0876331dfeadb70' 
  AND token = 'vh9YN2VADZwFxPqd8NhD5wGnRqvxYEcUgTyYVNcFYbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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