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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '04b81c040322e3a980b5a33a69a5206a8303e024d68e98fbe71c0302a5809002' 
  AND token = '09Q0mSjyDCWU/7G0Nep7PqpU0E8n6HJ2iDCqxntHRNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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