SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3182cae6e477b3aad94d92a32397a8929c8223a04a388e8cff568e37352d4ba5' 
  AND token = 'w15ijiyxHEztzp+6mPSZnrxgcqucD1q/sGqviQ0Ut4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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