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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a878659f3ae423baa6eb7d3c8b8f99b0444ec26b0dc06a107b1848fd9c4bd0bb' 
  AND token = 'CED3vap+JlhTlSmDlqfCX0MfFGI/vMECg2NwR2qMT4Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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