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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3da63a5eff29c919f35efecc474e26753cd8265dd735e96577c361a89796a60d' 
  AND token = '+340RX+rokxHN3H18A9EBLrC2xVz/GGl7pH6cEMJ+xU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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