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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c9f2eb40ff7593bec01f5c620d9546ea5fdc1e2dd3f62cdd98671651264ecfb4' 
  AND token = 'dsUc/0mrDENr2f8DpUtILBLc/Ab2R18qyaqHP5VGcRk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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