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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ccbe22ee4e021c58e8528a06357e2e20b202a59ab882d371a32de7b672bee5a' 
  AND token = '5FjiyOWGU1wlJK9Lh9mcu7eP4/jLH1BAy2DqIiOzwLk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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