SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9b5eb9324d5e084dfd5513b223c328e7beb4a3aa81a8f1aa4dd81ae5c5fb2426' 
  AND token = 'Ro0zzCPAzLmcwXzJRrV/QYysG8W3hFJEwVLaNqzqBvk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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