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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ee35fcc3dc406400dd6f3088a82cf5797a3e7ca5f5cb47be8a245142d48dccb4' 
  AND token = 'TMmaKcbfZ1vffH3QlHyXAP7wl9x3NrKkJvcENbIr3EQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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