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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '711d805b1bbf2d37623f552c46069d029d6a0cbee545cf398661653b24f3b684' 
  AND token = '4/7NiYOsU/Hbrzo6EjsEFz69Lbme+XdoEP//gcVh9Co=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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