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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a506a989975cbb3ab8e20c87473cca58a0c74cb1e67a7a26b55dbc7e5343e8d5' 
  AND token = 'HXwGfXpDhOp4WYa13VBCtNO7r2/dp0KbOth4X4TIz88=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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