SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9328f08d981f153c5dd2d0d06e73898f8f3599b9cbb4410d1a7a4c28ba46278a' 
  AND token = 'cHYCo7OKRWv2XYwsV6pD6MHPFYT7nOupgvN5PZjmtv0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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