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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '689da403ad6ab1a2a77d5476c896cfd777232f647580ae385aa9e9c9c2b7ab86' 
  AND token = '+NN96nOeDT8W6dlvLohs09cVudZxCl8h5YJtF0BsZyM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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