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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f1d5b19685f08f61a1adef4804e68a28b07bebe3ef8a20d15e50d45173ef9d29' 
  AND token = 'Ir25Y8HTTNzR8CYVe8BL0m2Wu9fecc4yprJSN2dasoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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