SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1eac170a7326819f84a162fb8d8c051545681057f913627555033b44493403b9' 
  AND token = '0tNsXGWtQ/d4EZh+HUSM3gEC+qPEpTKwJkidovOfbEQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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