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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f68bf087f26cbb71d6522c3a9aa3b278311a47e4160b5816d68b8b055df3ab38' 
  AND token = 'Z3Fzvs8OyW5hDArWQ1HDLSagcgijQfUqy6Xtw5s0ouI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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