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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'bf6eb1c03c5566ef3233b4aab5b239b1ee174b4498e0d13a12a0d335fb08914a' 
  AND token = 'yOOTw5K67AlhWF9LW7qpIxiKfNXL764UKIeYfCnq6E4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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