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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c5b6d6eecded8e2e4bf4a33f6224f40b05e2fc91061fbb6385799d4421fb5fda' 
  AND token = 'dInqojbHY952THMmr/7p+CQcGo6+v3rDTPuwsPexSxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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