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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '35d34e2686e36f04acab06dfe49ad0b4104f1479ac3f6f18e9688d46f791e791' 
  AND token = 'G6YNgYOM3jqslJYtyD6satcEcof7F3SCtVbA1eUYdIs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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