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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '0676741aa201add8b8eb369591bb414e5416371cf59b55a64a986fbf64a85a87' 
  AND token = 'SaVSRnn05LgYQb6SEvyoLKGDTN5pTWVU1S6QxxasxMo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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