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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1d139deba70ef2fa7f68f7dbcf72b7b24245f54f9a3a76bb99ee83954c42966f' 
  AND token = 'Z8R19PJUapt9JzonmT2fYF44e7YOOHPnBaQd3V5ntHE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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