SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5e7fa682351c781f933b0e9b32ae8acb56a16b2042e61951973ccb0e5ad3e356' 
  AND token = 'KmFlhYjvqV8bb1j/xyvTWHzUQ3kSS6kmMsLDHiy/PsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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