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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'db7487835de459eebaf3874e93fd86fb8c84ca2f7bec8a19b256daa411f7f101' 
  AND token = 'dWf63WxIPwhDeDfROqTBAx0AJHVTMnnhmg8rNjVB5VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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