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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ec93b94b2e88975834c65cc20475dde6c7030919e1a14c9828c599ed3df9d056' 
  AND token = 'rxDp3P5/XFLLz7nxGJUEU5/4Iwkws7OuQWwWFH/EJrc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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