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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c065a30d3457618806ec1e06ac977f439d4e5c5995bef5bce01d8ee1397ecbde' 
  AND token = 'SSrmVOw5ghCCl28NpxnB88xSavgfg0npms04zpdHRrA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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