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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '475aec73892a2accdb4190ddefef8434ef2dd6fe4f61f9f68a41ee6cad547562' 
  AND token = 'nKn7VzfyZX6y/BW5rCkfJqFHly7330ZHMEcr6o3Wmxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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