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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4616ab0b5f8cfa9d00877c34fb1a497db440fe2b0c31a7851dabf192bd9094d8' 
  AND token = 'kNorAhs+8DTqyJs5+dPHFVWh6J34Fi9WPe9TKoj2M1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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