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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ac1c963b476aa1aa8a48778e2a20bc681f68300231a46d2f17a341e5e27be590' 
  AND token = 'Y9MLlI3e5Xgr59NII/pfcDamEMxLZbLv+5xX4sxa09M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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