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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed8df0ac2e14e4ec45b755cde8f2894c74440af3997fcde2b7845c73e629308f' 
  AND token = 'nT36fmcVCBcghkK49y2NHDQ7HHoITJ+gn8vjpWW7He8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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