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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '092dfed966252be4d9d98967557d9afcce8695d9da38a0745a2e1d1672056da5' 
  AND token = 'Dy38Ynva6u+OvTm6WAgX2PavDYuITF1qreEHlSpTHfg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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