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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '530c2a405b35c1ef7e381a9cb7af1083184f888872e36e8e68b1f9aa1b6a90ea' 
  AND token = 'mm8AjqpaVmf8xFArrAPdUK2d8vqLnwgLBrx1IZDOIds=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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