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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9d5738011d2cd72e4b27b46b961152459106cecebead9601b2d61c3725f7c0ee' 
  AND token = 'Izw7WS0Asi056Ur1TQ2+F0Fpf9EvhsG/k7i956R+wgw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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