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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1b889b643da6df478fe600683d7e12291b4951f88ee070102dfb8c3d5fb7fe9f' 
  AND token = 'H8ZTfKKnmz45Egn00px3RkKJaWqPyuoeaQj+oT5+fNA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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