Sandbox

SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f77b51d30bf3229361b5c7d040b5b98de3dcb8c306ef01cbdd5bf6bb416e0ca4' 
  AND token = 'CVGI9iyHjsTKSwPfL9YWxUYTpPyOr+Y1nl7s0VkyQG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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