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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '84568493771e4599cee9f7650318a37fac5e6ce20d1f5a6569edbde0a59d9ba8' 
  AND token = '94jYOklCwDOMTX2RspMni/I+wH9bebkEJgRiedTivGE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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