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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac7df46cb8db95d7ec2fee75b63bdc68143ae8f25aa538dfbaf63f31b13e8333' 
  AND token = 'WRQscuODbBz52hTtM4y48jzSSA0+Y+SIrOatnzY+Xtw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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