SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae56a1206c3d186ef633398f6e17efe876706d342ae9f55503f28b21e8591a82' 
  AND token = 'n+ABP/kyyyvLp7BjCkRLq9BAIqMCFh0tpqydnZpJwWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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