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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4f1c56cf298e6bddd33e59d3ca1db6ca0d73271570afdb51ee73482e441f9dfb' 
  AND token = 'WXCWE9Lcf+A/fRe4hkeZQ4UJ/KRoIULw3gJHJCP/4UU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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