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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6aaec14c93dab2ef8d874d9f1579d0c3c0347c7784f9cb8a7633bcc90495b4a5' 
  AND token = '6ZWRjX3XXVzjvtKOLr9T9wQaJnTV6N9atMpWt/n3bnc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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