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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '7d47093b26037cda54581e5983564bb27e5f56a95d90dc2d1994acbe41d9c32e' 
  AND token = 'WNfoWFFo5ovBlcnk91ocr3coIro3fke9UKZd+hf8pFo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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