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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4ae574a810d5c499e274a775cc7b72de9589c2f40b59972ee78d7cbe8e56d53a' 
  AND token = 'j/u8T2TzJfDwbr3MAFOhXVhenO4S0ROo7+53SocAGOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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