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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5549bb1c58448a5378504a197be008d8cf89d2cba4b4b69829e6ae60b2d8af89' 
  AND token = 'tQixvkXrHXaOORIv0gX2Tsd0wTGF/e3xgCXdsPOXulU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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