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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8e94129b029da6239a7503796e5b3c9bc2d57bdbe09ccf8ce6c60de54a362683' 
  AND token = '7mybRrq7l4V1maT00jRiKpzRIxo0DKOuDhjNp1cxHIg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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